Tracey Emin once said, "It's harder to find a good female artist than a good prime minister." Depending on how you define "good," she was right about one thing: Women in art have historically lagged behind their male counterparts. Works by female artists do not sell for as much as those made by men, and the art scene in general is dominated by an array of powerful, intimidating male dealers and gallerists such as Larry Gagosian and Steve Lazarides. Women far outnumber men at art college and...